Steam or gas turbine.



n J.' STUMPP. 'STEAM 0R GAS TURBINE. APPBIOATION FILED FEB. 24.' 1903..

I0 MODEL.

UNITED STATES' atented .T une 9, 1903. PATnrrr1 OFFICE,

JOHANN STUMPF, OF CHARLOTTEN-BURG, GERMANY.

STEAM 0R eAs TUR-ems.

SPECIFICATION forming part of Letters Patent No. 730,416, dated June 9, 1903. Application filed February 24, 1903. l Serial No. MLLSL (No model.)

To all whom, it 11m/y con/cern:

Beit known that I, JOHANN STUMPF, a subject of the King of Prussia, German Emperor, and a resident of 28 Rankestrasse, Charlottenburg, near Berlin, Kingdom of Prussia, German Empire, haveinvented certain new and useful Improvements in Steam or Gas Turbines, of which the followingis an exact specification. Y

My invention relates to improvements in steam or gas turbines, and more especially to such turbines in which the pressure of the steam or compressed gas is transferred into streaming velocity, which is utilized in one or several bucket-rims. number of revolutions depends upon the n umber of steps in which the vtransferring of the pressure into streaming velocity takes place. It often occurs that the number of revolutions of the turbine has to be altered or changed, especially in case the turbine is used for driving screw-Propellers, pumps, or the like. In the turbines hitherto constructed the consumption of steam was always increased if the numbers of revolutions had to be reduced. In order to do away with this disadvantage, I arrange according to my invention so-called returnbuckets, by means of. which the steam leaving the buckets of the turbine-A wheel is returned into the same oris led into a second row of buckets or a second turbinewheel. These return-buckets can be inserted or removed, if desired, in such a way that the streaming energy of the steam can be utilized in one or several steps.

In order to make my invention more clear,

I refer to the accompanying drawing, which A shows a cross-section of a turbine constructed according to my invention.

In the example shown several turbine- Wheels situated upon the same axle areshown and return-buckets are arranged which lead the steam leaving the buckets of one turbine- 'wheel to the buckets of another one; but it will be understood that just as Well returnbuckets may be arranged which lead the steam back intothe buckets of the same turbine- Wheel. In the drawing three turbine-Wheels Z2 b' b2 are shown. The middle turbine-Wheel b is provided with a rim c, in Which are arranged double buckets according to the well- In such turbines the of the wheels'b' b2.

known Pelton wheel system. In the rims d diL of the turbine-wheels b' b2 are arranged order to lead the steam leaving these buckets to the buckets of the turbine-Wheels b and b2, four leading bucketl or vane rims or return vaneJrims gig2 and h' h2 are provided. The steam-jets flowing or streaming through the nozzlesf into the buckets of the rim c are divided in these buckets into two parts which iow through these buckets into the buckets of the leading bucket-rims g g2, in which the movement of the same is reversed, so that the steam can enter into the first row of buckets of the rims d and d2. After passing these buckets the direction of thesteam-jets is reversed again in the vanes orbuckets of the leading bucket-rims h h2, Iso that the steam enters into the last row of buckets or vanes After leaving these buckets the steam enters into the last row of bucklguide-pieces H152 for the rims 7i h2 are shown,

by means of .'which guide-pieces these rims can be moved sidewise within the turbinecasingc'; The means'for moving the rims may be constructed in any convenient way. In the drawing are shown links m 'm2, and a number of such links may be divided up over the whole circumference ofthe rim and may be moved simultaneously by means of a lever arrangement orv the like'. Guide-pieces and links o for the rim g'2 are indicated in the drawing in order to show that not only the outer, but also the inner, rims may be arranged so as to be capable of being removed. If, for instance, the number of revolutions of the turbine-Wheel amounts tofive hundred when all three turbine-Wheel rims are at work, as shown in the drawing, this number of revolutions will be augmented to one thousand as soon as the outer leading shovel-rims h h2 are removed, While the consumption of the steam remains the same. If then the following leading bucket or vane rims are removed so that the steam exhausts after leaving the rst turbine-wheel, the numbervof revolutions will rise to two thousand if the same consumption of steam takes place. Naturally the dierence between the numbers of revolutions need not be so considerable as iu the example above given.

It will be understood that it is not necessary to use a turbine with double buckets, for the invention may also be used in connection with turbines with single buckets in which the steam-jets are not divided into two parts. It will also be understood that the returnbucket rims need not be moved sdewise,' but that the same may be moved equally well in any other suitable direction. For instance the rim may be divided into several parts,

JOHANN STUMPF.

Witnesses:

HENRY HAsPER, WVOLDEMAR HAUPT. 

